Which best explains why the Germans sank US ships at the start of World War I?

The Germans were at war with the US and the other Allied Powers.
The Germans feared the US military was preparing for a naval offensive.
The Germans wanted to stop the US from trading with the Allied Powers.
The Germans wanted to frighten the US government into voting against a declaration of war.

The Germans wanted to stop the US from trading with the Allied Powers

Explanation:

The US was trading with the European Allies to help them supply the war. The Germans knew that if they sank their ships, they would starve the UK and France, thus making them unable to have supplies, food, and ammunition for the war.

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